| | NAME | DEFINITION | FORMULA | UNITS |
| u | IMAGE MAGNITUDE | measurement of the picture | (it's what you take measure) | mm |
| f | FOCAL LENGHT OF THE TELESCOPE | It's the distance from telescope lens to the image | (es un dato) | cm |
| s | IMAGE SCALE | Ratio between the image magnitude and the real image |  | radians |
| θ | ANGULAR DIAMETER | It is the visual diameter of the object measured as an angle. |  | radians |
| R | MOON'S RADIUS | It is half ot the Moon's diameter |  | km |
| D | MOON'S DIAMETER | It is what we are calculating |  | km |
| r | DISTANCE FROM MOON TO YOU | It is the distance from the Earth to the Moon | r = 384444 | km |